673517561 has 2 divisors, whose sum is σ = 673517562. Its totient is φ = 673517560.

The previous prime is 673517539. The next prime is 673517569. The reversal of 673517561 is 165715376.

673517561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 430313536 + 243204025 = 20744^2 + 15595^2 .

It is a cyclic number.

It is not a de Polignac number, because 673517561 - 2¹⁸ = 673255417 is a prime.

It is not a weakly prime, because it can be changed into another prime (673517569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336758780 + 336758781.

It is an arithmetic number, because the mean of its divisors is an integer number (336758781).

Almost surely, 2^673517561 is an apocalyptic number.

It is an amenable number.

673517561 is a deficient number, since it is larger than the sum of its proper divisors (1).

673517561 is an equidigital number, since it uses as much as digits as its factorization.

673517561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132300, while the sum is 41.

The square root of 673517561 is about 25952.2168802590. The cubic root of 673517561 is about 876.5626762652.

The spelling of 673517561 in words is "six hundred seventy-three million, five hundred seventeen thousand, five hundred sixty-one".